Avaliação tridimensional da anatomia e relações anatómicas do canal incisivo mandibular

Abstract

Introduction: During surgical procedures in the mandible, the mental interforaminal region is generally considered safe with minimal risk of affecting important structures. However, in the literature we find cases of surgical complications in the anterior mandible by injury of the incisive canal. A detailed study using three-dimensional radiographic techniques is essential during planning procedures. Purpose: Identification and characterization of the anatomy and the anatomical landmarks of the mandibular incisive canal. Methodology: Galilleos ViewerTM was used to perform measurements in cone beam computed tomographies. The presence and the course of the mandibular incisive canal, its internal vertical and bucco-lingual diameter, their relationship with buccal and lingual cortical and basal jaw, as well as its relationship with the apexes of adjacent teeth were evaluated. Results: After 42 scan analysis, the average length from mesial of the mental foramen to the midline is 24+2.02mm and the M.I.C’s recognizable length is 16.1+3.04mm. The diameter decreases as it approaches the middle line, where it becomes difficult to identify. The M.I.C. tends to be closer to the buccal cortical plate than it is to the lingual, also being closer to the apex of the adjacent teeth than the base of the jaw. We can determine a safe zone of 9.47 + 3.02mm below the C.I.M.. Regarding the dental apexes we verified a safe zone of 5.73 + 2.93mm in the canine region, 6.71 + 3.33mm in the lateral incisor area and 6.16 + 3.28mm in the central incisor area above the C.I.M. Conclusion: The M.I.C. was identified in all subjects. Evaluation by C.B.C.T. is effective and allows the collection of important data for diagnosis and treatment plan. The results can be applied in orthognathic surgery, implantology and extraction of impacted teeth

Date of Award	14 Sept 2016
Original language	Portuguese
Awarding Institution	Universidade Católica Portuguesa
Supervisor	Bruno Almeida (Supervisor) & Miguel Pereira (Co-Supervisor)